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Volumetric properties of supercritical ethane‐ n ‐heptane mixtures: Molar volumes and partial molar volumes
Author(s) -
Wu P. C.,
Ehrlich Paul
Publication year - 1973
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690190318
Subject(s) - supercritical fluid , molar , partial molar property , heptane , chemistry , thermodynamics , molar volume , physics , organic chemistry , geology , paleontology
Molar volumes were measured and partial molar volumes were calculated in the supercritical region, including the vicinity of the critical locus, lor compositions of 1.8 to 20 mole % n‐heptane. Molar volumes can he represented, to a reasonable approximation, by the Flory‐OrwollVrij (FOV) reduced equation of state. A better fit of the data is possible if the three exponents in the FOV equation are adjusted The irodified FOV equation or the Redlich‐Kwong equation, with parameters idjusted to fit the critical locus, can in general represent the partial molar rolumcs adequately along the critical locus only. The prediction of the imposition‐dependence of the partial molar volumes is only qualitatively successful at best.